Top weighting roller



April 3, 1956 E. F. SCHMID ET AL 2,740,164 TOP WEIGHTING ROLLER Filed April lO, 1952.

r v /iw United States Patent TOP WEIGHI-ING ROLLER Erwin Friedrich Schmid, Stuttgart, and Julius Raible, Stuttgart-Fraueukopf, Germany, assignors to SKF ugellagerfabrken Gesellschaft mit beschrankter Hafand the bearing housing were designed so as to form a comparatively long and uniformly narrow gap between the surfaces. However, it has proven that the fly accumulations gathering during operation in the vicinity ofthe spacing gap on the outslde enter the Spacing gap and that the accumulated fibre particles condense and coil up in the gap. In the end, the fly accumulations form within thel getting entangled, in the spacing gap nevertheless are set in motion within the bore of the top rolls in the direction of the roller bearing at each end of, and held by, the bearing housing. Nor could annular grooves provided in the surface of the bearing housmg behind the spacing gap prevent the joining and coilmg up of some flying fibrous matter causing the harmful braking effect. This braking effect, on the contrary, was considerably increased, once said grooves got clogged by fly accumulations.

Since top rolls of top weighting rollers, as a rule, cannot be removed for cleansing purposes without that special arrangements be made and without the use of special tools, it is of the greatest importance to prevent for as long periods as possible the objectionable entangling of some flying fibres into compact matter that may obstruct the spacing gap.

Besides, the restraining or braking action of the top rolls also occurs as a consequence of the radial impact of the top rolls which, though small in itself, may still suflice to squeeze together the penetrating fibres within the spacing gap into a mass getting more and more compact.

It has already been suggested to design the top rolls form, width, formsk a shorter sealing gap. ending in an abruptly expanding hollow space. In one design, the space between the top roll and the bearing housing is sealed by.v a U-n'ng attached to the bearing house, which Ur-ring accumulations and dust tend to hardenv the. felt packing ring which again results in a` braking effect.

Another known top Weighting roller construction, in which, however, the top rolls are supported by roller bear'- ings fitted on a nonrevolving shaft, provides for a narrow sealing gap communicating with an enlarged hollow space,

tact with the hollow space, thus being exposed to the influence of fly and dust particles gathering therein.

To the accomplishment of the foregoing and other objects which Will appear hereinafter, our invention consists ina top weighting roller for drawing mechanisms ofV Spinninu machines, 1n its elements, and the relation of the elements one to the other, as are described in the specification and sought to be defined in the claims.

The specification is accompanied by a drawing in which:

Fig. 1 is a longitudinal section taken through a pair of top rolls, illustrating one embodiment of our inventionk on the left-hand side and a modification on the right-hand side;

Fig. 2 is a partly sectioned view of another modification of a pair of top rolls; and

Fig. 3 is a partly sectioned View of still another modification of a pair of top rolls.

Referring to the drawing and having first reference to.

Figs. 1 to 3, a beari g housing 2 embraces a roller shaft to the width of the ring flange 8. From the relief rv of` the top roll, as well as from a relief b provided in the bearmg housing behind the gap area, the hollow space 10 and may be subdivided by an intermediate web 11. The chosen shape of the hollow space proves. advantageous in that the flying libre particles that may have got into it cannot reach the bearing directly but are first subjected to a detour. A radial bore I2 in the top roll 6 com; municates with the part of the hollow space 1 0, lyingy behind the bearing housing end.

The gap may also be of an angular design. In Fig. 1,. onthe right, an angular gap 9, is shown. Both the' straight gap 9 and the angular gap 9' is formed directly by the top rolls and the bearing housing.

In the cylindrical bore of the top rolls 6' of the construction according to Fig-l 2, there is a flange sleeve 14- communicating with an abruptly enlarged hollow space 10'. Fixed between the bearing outer ring 3 and the inturned end of the bearing housing 2 is a hood-like adapter 17 freely embracing the roller shaft 1 and forming with the bearing outer ring 3 an intermediate chamber 1S. In the type of construction shown in Fig. 2, a hanged sleeve is resiliently and removably inserted into the hollow space of each top roll to form the gap with the bearing housing.

In the construction shown in Fig. 3, a flange sleeve 19 is inserted in the cylindrical bore of top rolls 6". Another flange sleeve 20 is mounted on the bearing housing end. The two flanges 21 and 22 of the sleeves 19 and 20, respectively, form with the bearing housing surface a ring gap 23. The end of the ange sleeve 29 is bent-in to form a bottom ange 24 that embraces the roller shaft freely so that an intermediate chamber 25 is formed between the bottom flange 24 and the bearing outer ring 3. According to Fig. 3, two inserts are used to form the gap.

It is believed that the construction of our invention and the many advantages thereof will be fully understood from the foregoing detailed description thereof. It will be clear that it is a feature of our invention that the top rolls form directly or indirectly with the bearing housing surface short and very narrow axially extending sealing gaps with adjoining abruptly expanded hollow spaces. The bearing balls rotating in grooves of the roller shaft are associated with cuplike bearing outer rings which are embraced by the ends of the bearing housing and enclose the roller shaft freely.

According to another feature of the invention, if the size of the top rolls permits this, iianged sleeves may be tted into the bores of the top rolls and/or on the bearing housing ends to form angular sealing gaps. The iianges of such sleeves may be directed towards each other. The ends of the sleeves fitted on the bearing housing ends may be bent inwardly to form a bottom flange and also to serve as protective wall against the infiltration of fibre particles into the rolling bearings. Thus, in front of the roller bearings .an intermediate chamber is formed in which flying fibre particles are retained if they actually get through the hollow space adioining and many times surpassing the sealing gap in dimensions to the additional chamber.

Such an intermediate chamber, in accordance with our invention, may also be formed by a hoodlike piece of formed sheet metal attached between a bearing outer ring and an end of the bearing housing, and embracing the roller shaft playing freely.

Due to the construction according to our invention, it will .no longer be possible for flying ibre particles, even if their infiltration through the sealing gap cannot be prevented, to squeeze together into a coil-like hardening mass which is the reason for the objectionable jamming action heretofore experienced. The ying fibre particles are purposely given a chance to accumulate loosely in the abruptly enlarged hollow spaces, and the roller bearings are sealed against these particles by means of special, preferably multiple, partitions. lt has been found that the permanently loose accumulations even have a sealing effect and prevent that further dying iibre particles enter the sealing gap.

Another arrangernnt of the invention provides for radial bores in the top rolls, communicating with the hollow spaces provided for possible loose y accumulations so that after removal of the elastic covers pulled over the top roll members, which have to be renewed at infrequent intervals, the hollow spaces can easily be cleared by means of a needlelike tool or the like.

As a matter of fact, the inserting of sleeves is not absolutely necessary for the formation of cornered or angular gaps. Top rolls and the bearing housing may interlock with steplike surfaces as well.

It will be apparent that while we have shown and described our invention in a few forms only, many changes and modifications may be made without departing from the spirit of the invention defined in the following claims.

We claim:

1. Top weighting roller for drawing mechanisms of spinning machines, comprising a shaft, apair of top rolls fixediy mounted at the ends of the shaft, each roll having a wide hollow, the hollows opening toward one another, a stationary bearing housing rotatably receiving the shaft in annularly spaced relation and extending between and into the rolls, an antifriction bearing provided at each end of the bearing housing within the hollow of a roll, each bearing includinga grooved raceway provided in the shaft, to support a row of balls, and a cuplike outer race ring for a cup-contact with the balls, the outer race rings enclosing the shaft with play, the end portions of the bearing housing at least partly embracing the outer race rings, the rolls and the bearing housing being arranged and shaped so as to help form sealing gaps, said gaps being short and narrow in comparison with the hollows, the hollows expandingabruptly at `the inner ends of the gaps.

2. In Athe roller according to claim l, `the rolls and bearing housing forming angular sealing gaps.

3. In the roller according to claim l, members interposed between the rolls and the bearing housing to form said sealing gaps.

4. In the roller according to claim l, said bearing housing being relieved near each of the top rolls, a sleeve being resiliently and removably inserted into each. of said hollows, each sleeve being provided with a iiange, said iianges and the relieved -surfaces of the bearing housing forming angular gaps.

5. In the roller according to claim 4, said sleeves being slotted.

6. In the roller according to claim l, a sleeve being mounted in the hollow of each of lthe top rollers and ori each end of the bearing housing, respectively, said sleeves being provided with anges, said iianges helping to form sealing gaps. g v

7. In the roller according to claim 6, each of the sleeves mounted on the ends of the bearing housing being bent inwardly at its end and forming a bottom ange, each of said bottom iianges forming an intermediate chamber and embracing the rollershaft freely.

8. In the roller according to claim l, the ends-ofthe bearing housing being bent inwardly, the outer race Yrings being fitted directly in 4the bearing housing, ajhoodlike member lbeingmounted between each outer race ring and one of said bent-in ends, each hoodlike member forming an intermediate chamber and embracingthe roller shaft freely.

Referencesl Cited in the'le of this patent UNITED STATES PATENTS 71,477 Fuller Nov. 26, 1867 1,258,868 Buxton Mar. l2, 1918 1,286,936 Campbell Dec. l0, 1918 2,267,443 Cobb Dec.y 23, 194i 2,355,510 `Cobb Aug. 8,1944 2,525,592 Cotchett Oct. 10,1950

FOREIGN PATENTS 884,584 Francev Apr. 27, 1943 

